This is no coop-game though.
I would love to see a youth squad instead of the draft, such a system could utilize a system like you suggested, but only on the club level. There are many teams, that don't train at all, as it does not make sense in their situation.
Größter Knecht aller Zeiten aka His Excellency aka President for Life aka Field Marshal Al Hadji aka Lord of All the Beasts of the Earth and Fishes of the Seas aka aka Conqueror of the Buzzerbeater Empire in Europe in General and Austria in Particular